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Ahrends H.E., Brügger R., Stöckli R, Schenk J., Michna P., Jeanneret F., Wanner H., Eugster W., 2008. Quantitative phenological observations of a mixed beech forest in northern Switzerland with digital photography. Journal of Geophysical Research-Biogeosciences, 113, G04004, doi: 10.1029/2007JG000650.

Andrews, C., J. Dick, C. Jonasson, and Callaghan, T.V. 2011. Assessment of biological and environmental phenology at a landscape level from 30 years of fixed date repeat photography in Northern Sweden. Ambio. doi:10.1007/s13280-011-0167-z.

Bernard, E., Friedt, J. M., Tolle, F., Griselin, M., Martin, G., Laffly, D. and Marlin, C. , 2013. Monitoring seasonal snow dynamics using ground based high resolution photography (Austre Lovenbreen, Svalbard, 79 degrees N), ISPRSJ Photogramm,75, 92-100, doi:10.1016/j.isprsjprs.2012.11.001.

Heqing, Z., Gensuo J., 2013. impacts of Snow Cover on Vegetation Phenelogy in the Arctic from Satellite Data. Advances in Atmospheric Sciences vol. 30 issue 5 September 2013. p. 1421 - 1432

Hufkens, K, Friedl, M.A. Sonnetag, O., Braswell, B.H., Millman, T. and A.D. Richardson, 2012. Linking near-surface and satellite remote sensing measurements of deciduous broadleaf forest phenology, Remote Sensing of Environment, 117(15), pp. 366-380.

Migliavacca, M., M. Galvagno, E. Cremonese, M. Rossini, M. Meroni1, O. Sonnentag, S. Cogliati, G. Manca, F. Diotri, L. Busetto, A. Cescatti, R. Colombo, F. Fava, U. Morra di Cella, E. Pari, C. Siniscalco, and A.D. Richardson. 2011. Using digital repeat photography and eddy covariance data to model grassland phenology and photosynthetic CO2 uptake. Agricultural and Forest Meteorology, 151: 1325-1337, doi: 10.1016/j.agrformet.2011.05.012

Richardson, A.D., B.H. Braswell, D.Y. Hollinger, J.P. Jenkins and S.V. Ollinger. 2009. Near-surface remote sensing of spatial and temporal variation in canopy phenology. Ecological Applications, 19: 1417-1428.

Sonnentag, O., Hufkens, K.,Teshera-Sterne, Young, A.M., Friedl, M.A., Braswell, B.H., Milliman, T., O'Keefe, J., and A.D. Richardson, 2012, Digital repeat photography for phenological research in forest ecosystems, Agricultural and Forest Meteorology, 152, pp. 159-177.

Aubinet M., Grelle A., Ibrom A., Rannik Ü., Moncrieff J., Foken T., Kowalski A. S., Martin P. H., Berbigier P., Bernhofer Ch., Clement R., Elbers J. A., Granier A., Grünwald T., Morgenstern K., Pilegaard K., Rebmann C., Snijders W., Valentini R., and Vesala T., (2000) Estimates of the annual net carbon and water exchange of forests: the EUROFLUX methodology. Advances in Ecological Research, 30, 113-175.

Aurela, M, Laurila, T. and Tuovinen, J.-P. (2002) Annual CO2 balance of a subarctic fen in northern Europe: Importance of the wintertime efflux, J. Geophys. Res. 107, 4607, doi:10.1029/2002JD002055.

Aurela, M. (2005) Carbon dioxide exchange in subarctic ecosystems measured by a micrometeorological technique. Contributions 51, Finnish Meteorological Institute, Helsinki, ISSN 0782-6117, pp. 132 (T. Vesala; University of Helsinki)

Baldocchi, D., Falge, E., Gu, L., Olson, R., Hollinger, D., Running, S., Anthoni, P., Bernhofer, Ch., Davis, K., Evans, R., Fuentes, J., Goldstein, A., Katul, G., Law, B. E., Lee, X., Malhi, Y., Meyers, T., Munger, W., Oechel, W., Paw U, K. T., Pilegaard, K., Schmid, H. P., Valentini, R., Verma, S., Vesala, T., Wilson, K., and Wofsy., S. (2001) FLUXNET: A new tool to study the temporal and spatial variability of ecosystem-scale carbon dioxide, water vapor, and energy flux densities. Bulletin of the American Meteorological Society, 82, 2415-2434.

Baldocchi, D. (2003) Assessing the eddy covariance technique for evaluating carbon dioxide exchange rates of ecosystems: past, present and future. Global Change Biology, 9, 479-492.

Mammarella, I., Launiainen, S., Grönholm, T., Keronen, P., Pumpanen, J., Rannik, Ü. and Vesala, T. 2009. Relative humidity effect on the high-frequency attenuation of water vapor flux measured by a closed-path eddy covariance system. Journal of Atmospheric and Oceanic Technology, 26, 1856-1866.

McMillen, R. T. (1988) An eddy correlation technique with extended applicability to non-simple terrain. Boundary Layer Meteorology, 43, 231-245.

Rannik, Ü., Keronen, P., Hari, P. and Vesala, T. 2004. Estimation of forest-atmosphere CO 2 exchange by eddy covariance and profile techniques. Agricultural and Forest Meteorology, 126, 141-155.

Rannik, Ü, Vesala, T., and Keskinen, R. (1997) On the damping of temperature fluctuations in a circular tube relevant to the eddy covariance measurement technique. Journal of Geophysical Research, 102, 12789-12794.

Webb, E. K., Pearman, G. I., and Leuning, R. (1980). Correction of flux measurements for density effects due to heat and water vapour transfer. Quarterly Journal of the Royal Meteorological Society, 106, 85-100.

Thum, T., Räisänen, P., Sevanto, S., Tuomi, M., Reick, C., Vesala, T., Raddatz, T., Aalto, T., Järvinen, H., Altimir, N., Pilegaard, K., Zoltan, N., Rambal, S. and Liski, J. Soil carbon model alternatives for ECHAM5/JSBACH climate model: evaluation and impacts on global carbon cycle estimates. Journal of Geophysical Research, 116, G02028, doi:10.1029/2010JG001612, 2011